At the moment all profiles here are marked as posting to English, the default interface language.
It will take some tinkering and/or elbow grease to update the preferences of at least the busiest profiles like @Europarl_FR @Europarl_DE @europarl_it @europarl_es @Europarl_PL @europainitalia.
Marking #languages correctly is important so that people can filter by their preferred languages and have a seamless experience even if they don't speak English.